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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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45740847e2
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
934 lines
23 KiB
C
934 lines
23 KiB
C
/*
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* fs/cifs/transport.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org) 2006.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/gfp.h>
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#include <linux/wait.h>
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#include <linux/net.h>
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#include <linux/delay.h>
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#include <linux/freezer.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#include <linux/mempool.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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void
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cifs_wake_up_task(struct mid_q_entry *mid)
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{
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wake_up_process(mid->callback_data);
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}
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struct mid_q_entry *
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AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
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{
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struct mid_q_entry *temp;
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if (server == NULL) {
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cERROR(1, "Null TCP session in AllocMidQEntry");
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return NULL;
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}
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temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
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if (temp == NULL)
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return temp;
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else {
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memset(temp, 0, sizeof(struct mid_q_entry));
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temp->mid = smb_buffer->Mid; /* always LE */
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temp->pid = current->pid;
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temp->command = cpu_to_le16(smb_buffer->Command);
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cFYI(1, "For smb_command %d", smb_buffer->Command);
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/* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
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/* when mid allocated can be before when sent */
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temp->when_alloc = jiffies;
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temp->server = server;
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/*
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* The default is for the mid to be synchronous, so the
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* default callback just wakes up the current task.
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*/
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temp->callback = cifs_wake_up_task;
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temp->callback_data = current;
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}
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atomic_inc(&midCount);
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temp->mid_state = MID_REQUEST_ALLOCATED;
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return temp;
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}
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void
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DeleteMidQEntry(struct mid_q_entry *midEntry)
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{
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#ifdef CONFIG_CIFS_STATS2
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__le16 command = midEntry->server->vals->lock_cmd;
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unsigned long now;
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#endif
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midEntry->mid_state = MID_FREE;
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atomic_dec(&midCount);
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if (midEntry->large_buf)
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cifs_buf_release(midEntry->resp_buf);
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else
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cifs_small_buf_release(midEntry->resp_buf);
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#ifdef CONFIG_CIFS_STATS2
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now = jiffies;
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/* commands taking longer than one second are indications that
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something is wrong, unless it is quite a slow link or server */
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if ((now - midEntry->when_alloc) > HZ) {
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if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) {
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printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu",
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midEntry->command, midEntry->mid);
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printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
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now - midEntry->when_alloc,
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now - midEntry->when_sent,
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now - midEntry->when_received);
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}
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}
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#endif
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mempool_free(midEntry, cifs_mid_poolp);
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}
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static void
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delete_mid(struct mid_q_entry *mid)
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{
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spin_lock(&GlobalMid_Lock);
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list_del(&mid->qhead);
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spin_unlock(&GlobalMid_Lock);
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DeleteMidQEntry(mid);
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}
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static int
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smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
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{
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int rc = 0;
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int i = 0;
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struct msghdr smb_msg;
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unsigned int len = iov[0].iov_len;
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unsigned int total_len;
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int first_vec = 0;
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unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base);
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struct socket *ssocket = server->ssocket;
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if (ssocket == NULL)
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return -ENOTSOCK; /* BB eventually add reconnect code here */
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smb_msg.msg_name = (struct sockaddr *) &server->dstaddr;
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smb_msg.msg_namelen = sizeof(struct sockaddr);
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smb_msg.msg_control = NULL;
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smb_msg.msg_controllen = 0;
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if (server->noblocksnd)
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smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
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else
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smb_msg.msg_flags = MSG_NOSIGNAL;
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total_len = 0;
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for (i = 0; i < n_vec; i++)
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total_len += iov[i].iov_len;
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cFYI(1, "Sending smb: total_len %d", total_len);
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dump_smb(iov[0].iov_base, len);
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i = 0;
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while (total_len) {
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rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
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n_vec - first_vec, total_len);
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if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
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i++;
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/*
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* If blocking send we try 3 times, since each can block
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* for 5 seconds. For nonblocking we have to try more
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* but wait increasing amounts of time allowing time for
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* socket to clear. The overall time we wait in either
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* case to send on the socket is about 15 seconds.
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* Similarly we wait for 15 seconds for a response from
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* the server in SendReceive[2] for the server to send
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* a response back for most types of requests (except
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* SMB Write past end of file which can be slow, and
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* blocking lock operations). NFS waits slightly longer
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* than CIFS, but this can make it take longer for
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* nonresponsive servers to be detected and 15 seconds
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* is more than enough time for modern networks to
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* send a packet. In most cases if we fail to send
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* after the retries we will kill the socket and
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* reconnect which may clear the network problem.
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*/
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if ((i >= 14) || (!server->noblocksnd && (i > 2))) {
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cERROR(1, "sends on sock %p stuck for 15 seconds",
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ssocket);
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rc = -EAGAIN;
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break;
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}
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msleep(1 << i);
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continue;
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}
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if (rc < 0)
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break;
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if (rc == total_len) {
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total_len = 0;
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break;
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} else if (rc > total_len) {
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cERROR(1, "sent %d requested %d", rc, total_len);
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break;
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}
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if (rc == 0) {
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/* should never happen, letting socket clear before
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retrying is our only obvious option here */
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cERROR(1, "tcp sent no data");
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msleep(500);
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continue;
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}
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total_len -= rc;
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/* the line below resets i */
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for (i = first_vec; i < n_vec; i++) {
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if (iov[i].iov_len) {
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if (rc > iov[i].iov_len) {
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rc -= iov[i].iov_len;
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iov[i].iov_len = 0;
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} else {
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iov[i].iov_base += rc;
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iov[i].iov_len -= rc;
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first_vec = i;
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break;
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}
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}
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}
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i = 0; /* in case we get ENOSPC on the next send */
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}
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if ((total_len > 0) && (total_len != smb_buf_length + 4)) {
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cFYI(1, "partial send (%d remaining), terminating session",
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total_len);
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/* If we have only sent part of an SMB then the next SMB
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could be taken as the remainder of this one. We need
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to kill the socket so the server throws away the partial
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SMB */
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server->tcpStatus = CifsNeedReconnect;
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}
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if (rc < 0 && rc != -EINTR)
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cERROR(1, "Error %d sending data on socket to server", rc);
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else
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rc = 0;
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return rc;
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}
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int
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smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
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unsigned int smb_buf_length)
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{
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struct kvec iov;
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iov.iov_base = smb_buffer;
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iov.iov_len = smb_buf_length + 4;
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return smb_sendv(server, &iov, 1);
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}
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static int
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wait_for_free_credits(struct TCP_Server_Info *server, const int timeout,
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int *credits)
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{
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int rc;
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spin_lock(&server->req_lock);
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if (timeout == CIFS_ASYNC_OP) {
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/* oplock breaks must not be held up */
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server->in_flight++;
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*credits -= 1;
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spin_unlock(&server->req_lock);
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return 0;
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}
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while (1) {
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if (*credits <= 0) {
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spin_unlock(&server->req_lock);
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cifs_num_waiters_inc(server);
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rc = wait_event_killable(server->request_q,
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has_credits(server, credits));
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cifs_num_waiters_dec(server);
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if (rc)
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return rc;
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spin_lock(&server->req_lock);
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} else {
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if (server->tcpStatus == CifsExiting) {
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spin_unlock(&server->req_lock);
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return -ENOENT;
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}
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/*
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* Can not count locking commands against total
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* as they are allowed to block on server.
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*/
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/* update # of requests on the wire to server */
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if (timeout != CIFS_BLOCKING_OP) {
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*credits -= 1;
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server->in_flight++;
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}
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spin_unlock(&server->req_lock);
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break;
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}
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}
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return 0;
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}
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static int
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wait_for_free_request(struct TCP_Server_Info *server, const int timeout,
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const int optype)
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{
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return wait_for_free_credits(server, timeout,
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server->ops->get_credits_field(server, optype));
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}
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static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
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struct mid_q_entry **ppmidQ)
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{
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if (ses->server->tcpStatus == CifsExiting) {
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return -ENOENT;
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}
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if (ses->server->tcpStatus == CifsNeedReconnect) {
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cFYI(1, "tcp session dead - return to caller to retry");
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return -EAGAIN;
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}
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if (ses->status != CifsGood) {
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/* check if SMB session is bad because we are setting it up */
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if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
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(in_buf->Command != SMB_COM_NEGOTIATE))
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return -EAGAIN;
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/* else ok - we are setting up session */
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}
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*ppmidQ = AllocMidQEntry(in_buf, ses->server);
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if (*ppmidQ == NULL)
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return -ENOMEM;
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spin_lock(&GlobalMid_Lock);
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list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
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spin_unlock(&GlobalMid_Lock);
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return 0;
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}
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static int
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wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
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{
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int error;
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error = wait_event_freezekillable(server->response_q,
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midQ->mid_state != MID_REQUEST_SUBMITTED);
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if (error < 0)
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return -ERESTARTSYS;
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return 0;
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}
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int
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cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov,
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unsigned int nvec, struct mid_q_entry **ret_mid)
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{
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int rc;
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struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base;
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struct mid_q_entry *mid;
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/* enable signing if server requires it */
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if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
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hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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mid = AllocMidQEntry(hdr, server);
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if (mid == NULL)
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return -ENOMEM;
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rc = cifs_sign_smbv(iov, nvec, server, &mid->sequence_number);
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if (rc) {
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DeleteMidQEntry(mid);
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return rc;
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}
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*ret_mid = mid;
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return 0;
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}
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/*
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* Send a SMB request and set the callback function in the mid to handle
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* the result. Caller is responsible for dealing with timeouts.
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*/
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int
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cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
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unsigned int nvec, mid_receive_t *receive,
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mid_callback_t *callback, void *cbdata, const int flags)
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{
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int rc, timeout, optype;
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struct mid_q_entry *mid;
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timeout = flags & CIFS_TIMEOUT_MASK;
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optype = flags & CIFS_OP_MASK;
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rc = wait_for_free_request(server, timeout, optype);
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if (rc)
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return rc;
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mutex_lock(&server->srv_mutex);
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rc = server->ops->setup_async_request(server, iov, nvec, &mid);
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if (rc) {
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mutex_unlock(&server->srv_mutex);
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add_credits(server, 1, optype);
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wake_up(&server->request_q);
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return rc;
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}
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mid->receive = receive;
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mid->callback = callback;
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mid->callback_data = cbdata;
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mid->mid_state = MID_REQUEST_SUBMITTED;
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/* put it on the pending_mid_q */
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spin_lock(&GlobalMid_Lock);
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list_add_tail(&mid->qhead, &server->pending_mid_q);
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spin_unlock(&GlobalMid_Lock);
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cifs_in_send_inc(server);
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rc = smb_sendv(server, iov, nvec);
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cifs_in_send_dec(server);
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cifs_save_when_sent(mid);
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mutex_unlock(&server->srv_mutex);
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if (rc == 0)
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return 0;
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delete_mid(mid);
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add_credits(server, 1, optype);
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wake_up(&server->request_q);
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return rc;
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}
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/*
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*
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* Send an SMB Request. No response info (other than return code)
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* needs to be parsed.
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*
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* flags indicate the type of request buffer and how long to wait
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* and whether to log NT STATUS code (error) before mapping it to POSIX error
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*
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*/
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int
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SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
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char *in_buf, int flags)
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{
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int rc;
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struct kvec iov[1];
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int resp_buf_type;
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iov[0].iov_base = in_buf;
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iov[0].iov_len = get_rfc1002_length(in_buf) + 4;
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flags |= CIFS_NO_RESP;
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rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
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cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc);
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return rc;
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}
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|
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static int
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cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
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{
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int rc = 0;
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cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__,
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le16_to_cpu(mid->command), mid->mid, mid->mid_state);
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spin_lock(&GlobalMid_Lock);
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switch (mid->mid_state) {
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case MID_RESPONSE_RECEIVED:
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spin_unlock(&GlobalMid_Lock);
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return rc;
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case MID_RETRY_NEEDED:
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rc = -EAGAIN;
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break;
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case MID_RESPONSE_MALFORMED:
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rc = -EIO;
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break;
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case MID_SHUTDOWN:
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rc = -EHOSTDOWN;
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break;
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default:
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list_del_init(&mid->qhead);
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cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__,
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mid->mid, mid->mid_state);
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rc = -EIO;
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}
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spin_unlock(&GlobalMid_Lock);
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DeleteMidQEntry(mid);
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return rc;
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}
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|
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static inline int
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send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid)
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{
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return server->ops->send_cancel ?
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server->ops->send_cancel(server, buf, mid) : 0;
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}
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|
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int
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cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
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bool log_error)
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{
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unsigned int len = get_rfc1002_length(mid->resp_buf) + 4;
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|
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dump_smb(mid->resp_buf, min_t(u32, 92, len));
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|
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/* convert the length into a more usable form */
|
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if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
|
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struct kvec iov;
|
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|
|
iov.iov_base = mid->resp_buf;
|
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iov.iov_len = len;
|
|
/* FIXME: add code to kill session */
|
|
if (cifs_verify_signature(&iov, 1, server,
|
|
mid->sequence_number + 1) != 0)
|
|
cERROR(1, "Unexpected SMB signature");
|
|
}
|
|
|
|
/* BB special case reconnect tid and uid here? */
|
|
return map_smb_to_linux_error(mid->resp_buf, log_error);
|
|
}
|
|
|
|
int
|
|
cifs_setup_request(struct cifs_ses *ses, struct kvec *iov,
|
|
unsigned int nvec, struct mid_q_entry **ret_mid)
|
|
{
|
|
int rc;
|
|
struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base;
|
|
struct mid_q_entry *mid;
|
|
|
|
rc = allocate_mid(ses, hdr, &mid);
|
|
if (rc)
|
|
return rc;
|
|
rc = cifs_sign_smbv(iov, nvec, ses->server, &mid->sequence_number);
|
|
if (rc)
|
|
delete_mid(mid);
|
|
*ret_mid = mid;
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SendReceive2(const unsigned int xid, struct cifs_ses *ses,
|
|
struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
|
|
const int flags)
|
|
{
|
|
int rc = 0;
|
|
int timeout, optype;
|
|
struct mid_q_entry *midQ;
|
|
char *buf = iov[0].iov_base;
|
|
unsigned int credits = 1;
|
|
|
|
timeout = flags & CIFS_TIMEOUT_MASK;
|
|
optype = flags & CIFS_OP_MASK;
|
|
|
|
*resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */
|
|
|
|
if ((ses == NULL) || (ses->server == NULL)) {
|
|
cifs_small_buf_release(buf);
|
|
cERROR(1, "Null session");
|
|
return -EIO;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsExiting) {
|
|
cifs_small_buf_release(buf);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* Ensure that we do not send more than 50 overlapping requests
|
|
* to the same server. We may make this configurable later or
|
|
* use ses->maxReq.
|
|
*/
|
|
|
|
rc = wait_for_free_request(ses->server, timeout, optype);
|
|
if (rc) {
|
|
cifs_small_buf_release(buf);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Make sure that we sign in the same order that we send on this socket
|
|
* and avoid races inside tcp sendmsg code that could cause corruption
|
|
* of smb data.
|
|
*/
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = ses->server->ops->setup_request(ses, iov, n_vec, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
cifs_small_buf_release(buf);
|
|
/* Update # of requests on wire to server */
|
|
add_credits(ses->server, 1, optype);
|
|
return rc;
|
|
}
|
|
|
|
midQ->mid_state = MID_REQUEST_SUBMITTED;
|
|
cifs_in_send_inc(ses->server);
|
|
rc = smb_sendv(ses->server, iov, n_vec);
|
|
cifs_in_send_dec(ses->server);
|
|
cifs_save_when_sent(midQ);
|
|
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0) {
|
|
cifs_small_buf_release(buf);
|
|
goto out;
|
|
}
|
|
|
|
if (timeout == CIFS_ASYNC_OP) {
|
|
cifs_small_buf_release(buf);
|
|
goto out;
|
|
}
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc != 0) {
|
|
send_cancel(ses->server, buf, midQ);
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
|
|
midQ->callback = DeleteMidQEntry;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
cifs_small_buf_release(buf);
|
|
add_credits(ses->server, 1, optype);
|
|
return rc;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
cifs_small_buf_release(buf);
|
|
|
|
rc = cifs_sync_mid_result(midQ, ses->server);
|
|
if (rc != 0) {
|
|
add_credits(ses->server, 1, optype);
|
|
return rc;
|
|
}
|
|
|
|
if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) {
|
|
rc = -EIO;
|
|
cFYI(1, "Bad MID state?");
|
|
goto out;
|
|
}
|
|
|
|
buf = (char *)midQ->resp_buf;
|
|
iov[0].iov_base = buf;
|
|
iov[0].iov_len = get_rfc1002_length(buf) + 4;
|
|
if (midQ->large_buf)
|
|
*resp_buf_type = CIFS_LARGE_BUFFER;
|
|
else
|
|
*resp_buf_type = CIFS_SMALL_BUFFER;
|
|
|
|
credits = ses->server->ops->get_credits(midQ);
|
|
|
|
rc = ses->server->ops->check_receive(midQ, ses->server,
|
|
flags & CIFS_LOG_ERROR);
|
|
|
|
/* mark it so buf will not be freed by delete_mid */
|
|
if ((flags & CIFS_NO_RESP) == 0)
|
|
midQ->resp_buf = NULL;
|
|
out:
|
|
delete_mid(midQ);
|
|
add_credits(ses->server, credits, optype);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
SendReceive(const unsigned int xid, struct cifs_ses *ses,
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
|
int *pbytes_returned, const int timeout)
|
|
{
|
|
int rc = 0;
|
|
struct mid_q_entry *midQ;
|
|
|
|
if (ses == NULL) {
|
|
cERROR(1, "Null smb session");
|
|
return -EIO;
|
|
}
|
|
if (ses->server == NULL) {
|
|
cERROR(1, "Null tcp session");
|
|
return -EIO;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
return -ENOENT;
|
|
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
|
to the same server. We may make this configurable later or
|
|
use ses->maxReq */
|
|
|
|
if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
|
|
MAX_CIFS_HDR_SIZE - 4) {
|
|
cERROR(1, "Illegal length, greater than maximum frame, %d",
|
|
be32_to_cpu(in_buf->smb_buf_length));
|
|
return -EIO;
|
|
}
|
|
|
|
rc = wait_for_free_request(ses->server, timeout, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* make sure that we sign in the same order that we send on this socket
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
|
of smb data */
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
/* Update # of requests on wire to server */
|
|
add_credits(ses->server, 1, 0);
|
|
return rc;
|
|
}
|
|
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
goto out;
|
|
}
|
|
|
|
midQ->mid_state = MID_REQUEST_SUBMITTED;
|
|
|
|
cifs_in_send_inc(ses->server);
|
|
rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
|
|
cifs_in_send_dec(ses->server);
|
|
cifs_save_when_sent(midQ);
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0)
|
|
goto out;
|
|
|
|
if (timeout == CIFS_ASYNC_OP)
|
|
goto out;
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc != 0) {
|
|
send_cancel(ses->server, in_buf, midQ);
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
|
|
/* no longer considered to be "in-flight" */
|
|
midQ->callback = DeleteMidQEntry;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
add_credits(ses->server, 1, 0);
|
|
return rc;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
rc = cifs_sync_mid_result(midQ, ses->server);
|
|
if (rc != 0) {
|
|
add_credits(ses->server, 1, 0);
|
|
return rc;
|
|
}
|
|
|
|
if (!midQ->resp_buf || !out_buf ||
|
|
midQ->mid_state != MID_RESPONSE_RECEIVED) {
|
|
rc = -EIO;
|
|
cERROR(1, "Bad MID state?");
|
|
goto out;
|
|
}
|
|
|
|
*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
|
|
memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
|
|
rc = cifs_check_receive(midQ, ses->server, 0);
|
|
out:
|
|
delete_mid(midQ);
|
|
add_credits(ses->server, 1, 0);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
|
|
blocking lock to return. */
|
|
|
|
static int
|
|
send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct smb_hdr *in_buf,
|
|
struct smb_hdr *out_buf)
|
|
{
|
|
int bytes_returned;
|
|
struct cifs_ses *ses = tcon->ses;
|
|
LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
|
|
|
|
/* We just modify the current in_buf to change
|
|
the type of lock from LOCKING_ANDX_SHARED_LOCK
|
|
or LOCKING_ANDX_EXCLUSIVE_LOCK to
|
|
LOCKING_ANDX_CANCEL_LOCK. */
|
|
|
|
pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
|
|
pSMB->Timeout = 0;
|
|
pSMB->hdr.Mid = get_next_mid(ses->server);
|
|
|
|
return SendReceive(xid, ses, in_buf, out_buf,
|
|
&bytes_returned, 0);
|
|
}
|
|
|
|
int
|
|
SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
|
|
int *pbytes_returned)
|
|
{
|
|
int rc = 0;
|
|
int rstart = 0;
|
|
struct mid_q_entry *midQ;
|
|
struct cifs_ses *ses;
|
|
|
|
if (tcon == NULL || tcon->ses == NULL) {
|
|
cERROR(1, "Null smb session");
|
|
return -EIO;
|
|
}
|
|
ses = tcon->ses;
|
|
|
|
if (ses->server == NULL) {
|
|
cERROR(1, "Null tcp session");
|
|
return -EIO;
|
|
}
|
|
|
|
if (ses->server->tcpStatus == CifsExiting)
|
|
return -ENOENT;
|
|
|
|
/* Ensure that we do not send more than 50 overlapping requests
|
|
to the same server. We may make this configurable later or
|
|
use ses->maxReq */
|
|
|
|
if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
|
|
MAX_CIFS_HDR_SIZE - 4) {
|
|
cERROR(1, "Illegal length, greater than maximum frame, %d",
|
|
be32_to_cpu(in_buf->smb_buf_length));
|
|
return -EIO;
|
|
}
|
|
|
|
rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* make sure that we sign in the same order that we send on this socket
|
|
and avoid races inside tcp sendmsg code that could cause corruption
|
|
of smb data */
|
|
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
|
|
rc = allocate_mid(ses, in_buf, &midQ);
|
|
if (rc) {
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
|
|
if (rc) {
|
|
delete_mid(midQ);
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
return rc;
|
|
}
|
|
|
|
midQ->mid_state = MID_REQUEST_SUBMITTED;
|
|
cifs_in_send_inc(ses->server);
|
|
rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
|
|
cifs_in_send_dec(ses->server);
|
|
cifs_save_when_sent(midQ);
|
|
mutex_unlock(&ses->server->srv_mutex);
|
|
|
|
if (rc < 0) {
|
|
delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
|
|
/* Wait for a reply - allow signals to interrupt. */
|
|
rc = wait_event_interruptible(ses->server->response_q,
|
|
(!(midQ->mid_state == MID_REQUEST_SUBMITTED)) ||
|
|
((ses->server->tcpStatus != CifsGood) &&
|
|
(ses->server->tcpStatus != CifsNew)));
|
|
|
|
/* Were we interrupted by a signal ? */
|
|
if ((rc == -ERESTARTSYS) &&
|
|
(midQ->mid_state == MID_REQUEST_SUBMITTED) &&
|
|
((ses->server->tcpStatus == CifsGood) ||
|
|
(ses->server->tcpStatus == CifsNew))) {
|
|
|
|
if (in_buf->Command == SMB_COM_TRANSACTION2) {
|
|
/* POSIX lock. We send a NT_CANCEL SMB to cause the
|
|
blocking lock to return. */
|
|
rc = send_cancel(ses->server, in_buf, midQ);
|
|
if (rc) {
|
|
delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
} else {
|
|
/* Windows lock. We send a LOCKINGX_CANCEL_LOCK
|
|
to cause the blocking lock to return. */
|
|
|
|
rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
|
|
|
|
/* If we get -ENOLCK back the lock may have
|
|
already been removed. Don't exit in this case. */
|
|
if (rc && rc != -ENOLCK) {
|
|
delete_mid(midQ);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
rc = wait_for_response(ses->server, midQ);
|
|
if (rc) {
|
|
send_cancel(ses->server, in_buf, midQ);
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
|
|
/* no longer considered to be "in-flight" */
|
|
midQ->callback = DeleteMidQEntry;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
return rc;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
/* We got the response - restart system call. */
|
|
rstart = 1;
|
|
}
|
|
|
|
rc = cifs_sync_mid_result(midQ, ses->server);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
/* rcvd frame is ok */
|
|
if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) {
|
|
rc = -EIO;
|
|
cERROR(1, "Bad MID state?");
|
|
goto out;
|
|
}
|
|
|
|
*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
|
|
memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
|
|
rc = cifs_check_receive(midQ, ses->server, 0);
|
|
out:
|
|
delete_mid(midQ);
|
|
if (rstart && rc == -EACCES)
|
|
return -ERESTARTSYS;
|
|
return rc;
|
|
}
|